Classification
330 - Economics
658 - General management
920
000 - Computer science, information & general works
724
500 - Natural sciences & mathematics
315
338 - Production
306
700 - The arts; fine & decorative arts
302
333 - Economics of land & energy
299
363 - Other social problems & services
259
300 - Social sciences
254
331 - Labor economics
240
600 - Technology
231
380 - Commerce, communications & transportation
194
302 - Social interaction
187
620 - Engineering & allied operations
167
320 - Political science
164
670 - Manufacturing
162
005 - Computer programming, programs & data
147
384 - Communications; telecommunication
110
610 - Medicine & health
108
004 - Data processing & computer science
101
140 - Specific philosophical schools
99
551 - Geology, hydrology & meteorology
95
900 - History & geography
94
580 - Plants (Botany)
82
381 - Commerce
78
630 - Agriculture & related technologies
66
576 - Genetics & evolution
60
650 - Management & auxiliary services
52
370 - Education
42
340 - Law
40
540 - Chemistry & allied sciences
36
720 - Architecture
35
581 - Specific topics in natural history
33
304 - Factors affecting social behavior
32
332 - Financial economics
32
800 - Literature & rhetoric
32
001 - Knowledge
31
530 - Physics
31
745 - Decorative arts
31
006 - Special computer methods
30
153 - Mental processes & intelligence
29
400 - Language
26
657 - Accounting
26
100 - Philosophy & psychology
24
510 - Mathematics
24
170 - Ethics
19
519 - Probabilities & applied mathematics
19
414 - Phonology & phonetics
16
368 - Insurance
15
410 - Linguistics
15
more ...